I say to her, "So, does that mean I can play tonight, but next week I'm out of luck?"
"Yes!" she says.
Ten minutes later she comes to me and tells me that she is finished with dusting, at which point I quiz her about all the places she has dusted. I ask her "So if I come in your room and run my finger along your chair rail, I'm not going to find any dust, right?"
"Are you sure you don't want to double check that?"
"Uh, maybe I'll go check again."
So she goes back to check and I hear her grumbling about it. Then she yells "WHY do I keep dusting and it keeps coming back?!!!! Aaaaah."
That, my friends, is why I don't dust. It's pointless.